Electric lamp



(No Model.)

0. E. LONG.

ELECTRIC LAMP. 110. 249,149. Patented Nov. 1,1881.

IVzZnasse j awwl Mg. fem/1%, W flit- UNITED STATES PATENT OFFICE.

CHARLES E. LONG, OF NEW YORK, N. Y., ASSIGNOR TO HIMSELF, ABRAHAM M.LORYEA, OF SAN FRANCISCO,

OF NEW YORK, N. Y.

CALIFORNIA, AND BERNARD LANDE,

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 249,149, dated November1, 1881.

' Application filed September 29, 1881. (No model.)

To all whom it may concern Beitknown th at I, CHARLES EDWARD LONG, ofthe city of New York, county and State of New York, have inventedcertain new and useful Improvements in Electric Lamps, of which thefollowing is a specification.

This invention relates to that class of electric lamps in which thelower carbon is held stationary in the-frame, and the upper carbonraised up from it to form the are, and allowed to gradually feed down asthe carbons are consumed.

It consists of'a novel arrangement of the two actuating electro-magnets,and in the construction of the devices by which the upper carbon iscontrolled by the'differential action of the two electro-magnets, one ofwhich is wound with large wire, and is included in the arc-circuit, andthe other one with fine wire and included in a derived or branchcircuit.

Each magnet acts by induction on independent armatures 'adjustablyconnected to two lever-arms arranged diametrically opposite one anotheron a rock-shaft, and this shaft is conuected by alink to the uppercarbon-rod-clampin g device at a point much nearer the center of theshaft than are the armatures, so that the eleetro-magnets have to drawtheir arniatures through a long range of movement to impart 0 a shortrange of movement to the carbon, thereby greatly increasing theregulating powers of the electro-magnets and making the regulation ofthe feed of the carbon very uniform, on account of the delicate actionof the mag- 3 5 nets due to increase of leverage of their armatures overthe movement of the clamping device. The rock-shaft is provided with anadjusting-spring set to oppose and assist to regulate the power of themain-circuit elec'tro-m ag- 40 net on its armature, and it is furtherprovided with a dash-pot.

Theimprovementsin the construction and the operation of the variousparts will be fully understood by reference had to the accompanyingdrawings and the following description thereof.

Figure l is a front elevation of my improvements in electric-lightingapparatus. Fig. 2 is a plan view of the same with the upper part of theframe cut off. Fig. 3 is a side view sectional elevation cut through thelineww, looking toward the left; and Fig. 4 is a side view sectionalelevation cut through the line y 1 looking toward the right.

The upper part of the frame consists of the plate a, and standards a a,and cross-piece 0. in the center of which is a hole in line with a holein the plate a, and through which the upper-carbon-holding rod, 1),passes. A tube, 0, is screwed in the cross-piece a and incases the rod1), and by it the lamp is suspended.

, In arms projecting from the plate a are secured, by insulatedconnections, the side rods, 01 and d, the upper ends of which areprovided, respectively, with the binding-posts e and c. The lower endsof the side rods are secured to, the cross-barf,- and in a socket in thecenter ofit is held the lower carbon, g, the bar 61 by means of aninsulated connection, and the bar at by metallic contact therewith. o

Pivoted on pointed bearings-in the standards a a is the rock-shaft h,framed at its center to surround the carbon-holdin g rod b, and at oneside of this center framing is formed a slot, in which is pivoted thehanging link i, connected at its lower end to the clampj. This clampjhas a hole in it slightly larger than the rod b, so that the rod is freeto fall down through it when the clamp is in a horizontal position; butthe rod is held by the clamp when it is moved into an angular positionby the rocking of the shaft h. The clamp is also provided with atail-piece, j, on the outer end of which rests the spring j secured tothe plate a.

The double armature-lever 7c is secured to the rockshaft h by aset-screw passing through its hub, and by means of which they may be setin relation to one another to properly locate the armatures l and m,carried by the double lever 70, in proper relation to the poles of theelectro-magnets l and m, when the clamp j is about to gripe the rod b,-or the rock-shaft h and double lever 70 may be cast in one piece of somenon-magnetic material, and the requisite adjustment provided for bymaking the link i 5 adjustable as to its length.

The armatures Z and m are circular pieces of iron with threaded stems atone of their sides,

and said stems fit into tapped holes in the ends of the double lever k,so that by turning the armature their front faces are moved to or fromthe poles of the electro-magnets Z and m, to regulate the attractivepowers of the magnets on the armatures, and when the armatures areproperly set they are held rigidly in place by the set-screws Z and mwhich closes by means of slots the tapped holes tight on the threadedstems of the armature. The cores of the electro-magnets Z and m areconnected to the plate a, which, with the rest of the frame, is made ofiron, so that each core is affected somewhat by the change of currentpassing through the insulated wire of the other. The wire on the magnetl is the large wire, and the electric current entering the lamp by thebinding-post 0 passes through it, and then goes to the frame a a a, downthe rod 1), through the carbon 1), to the carbon g, and from it up theside rod, 61, and so leaves the lamp by the post 0. The current in sopassing causes the magnet l to draw down the armature l, and so raisesup the upper carbon to form the are, but at the same time some of thecurrent passes through the branch circuit formed by the :line wiresurrounding the core of the magnet at, one end of which is connected tothe large wire as it leaves the post 0, and the other end is connectedto the other post, 0. The wire of the two magnets is so proportioned andtheir armatures so set in relation to the poles that the action of thetwo magnets balance one another on the double lever 70 when the arc isnormal; but as soon as the are becomes abnormal the current is decreasedin the magnet Z and increased in the magnet m,- consequently the lever kis moved in an opposite direction to when the are is being formed, andthe clamp and rod 1) lowered gradually, the clamp allowing the rod toslide through it when it reaches its lowest position to bring the are toits normal condition; but further movement of'the rod bis instantlyarrested by the increase of current passing through the magnet l.

The cores of the magnets l and on, as before stated, are shown asconnected together by the iron plate a. They may be made independent ofone another, and each one be of horseshoe shape, their proper action onthe clamping de vice being in any case easily attained by the adjustmentof their armatures; and instead of being placed in vertical positions,as shown, it is evident they may be placed horizontally without alteringtheir action on the lever'L.

To one end of a double arm, 0, on the shaft h is connected the spring11, the other end, which is connected to the bell'cranlc lever n,pivoted in theframe n", and through this frame passes the set-screw nbutting against the short arm of the bell-crank lever a, and by means ofwhich the tension of the spring a is regulated, as desired, to opposethe proper amount of resistance to the action of the magnet Z on itsarmature I. On the other end of the arm 0 is connected the plunger ofthe dashpot p, which is of the ordinary construction, and for thepurpose well understood; so a further description of it here isunnecessary.

Having now described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. In combination, the eleetro-magnets l and m, the armatures l and m,adjustably connected to the levers 7a of the rock-shaft h, the rod 1),passing vertically freely through an opening in the rock-shaft h, and aclamping device, substantially as described, operated by the rock-shaftto raise the rod 1) when the armature Z is attracted by itseleetro-magnet l.

2. The armatures Zm, provided with screwthreaded stems,in combinationwith the levers It, provided with tapped and slotted holes, andset-screws 1 m substantially as and for the purpose set forth.

3. The bell-crank lever a, screw a, spring n, arm 0, dash-pot 1), andlever 7; on shaft h, armature l, and electro-magnet l, in combinationsubstantially as and for the purpose set forth.

In witness whereof I have hereunto set my hand at New York, county andState of New York, this 27th day of September, A. D. 1881.

CHARLES E. LONG.

Witnesses:

ALFRED SHEnLocK, ABRAM M. LORYEA.

